Dovetail-cutter.



W. G. STROZIBR.

DOVETAIL CUTTER.

APPLICATION FILED JAN. 4, 1913.

Patented Aug. 19, 1913.

I 0 Attorneys,

WTTED STATES PATENT @FFTQE.

WEBSTER G. STBOZ IER, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OFO1\TE- HALF TO CHARLES C. SINCLAIR, OF WASHINGTON, DISTRICT OF COLUMBIA.

DOVETAIL-CUTTER.

Application filed January 4, 1913.

To all whom it may concern:

Be it known that I, WEBSTER G. S'rRozrnR, a citizen of the UnitedStates, residing at lVashington, in the District of Columbia, haveinvented a new and useful Dovetail- Gutter, of which the following is aspecification.

This invention relates to tools for cutting upon balusters and likedevices, dovetails such as employed in connecting balusters, etc., tostairs, balconies, and the like.

One of the objects of the invention is to provide a cutter head adaptedto be connected to the spindle of an ordinary lathe, the said cutterhead having a cutter which is adjustable about an eccentrically disposedaxis for the purpose of bringing any one of a series of bladessuccessively into engagement with the work so as thus to graduallyreduce and shape that portion of the object fed to the tool.

Another object is to provide improved means for adjusting the cuttingtool relative to the head while the head is rotating.

lVith the foregoing and other objects in View which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings :Figure 1 is a central longitudinal section through thecutter head, the same being shown in position upon a lathe spindle. Fig.2 is an end elevation of the cutter head. Fig. 3 is a section on lineA-B Fig. 1. Fig. 1 is a section through a slightly modified form ofdevice.

Referring to the figures by characters of reference 1 designates adisk-like head having a cylindrical extension 2 upon the back facethereof, this extension being concentric with the head and provided, atits free end, with a bore 3 designed to receive the spindle S of alathe. This extension may be securely fastened to the spindle by meansof a set screw 4: or in any other suitable manner.

Head 1 is provided, at diametrically opposed points, with bores 5 inwhich are journaled spindles 6 and 7 Spindle 6 is pro- Specification ofLetters Patent.

Patented Ari 19,1913.

Serial No. 740,223.

vided at one end with a cutting tool 8 which is eccentrically mounted onthe spindle and is provided with a plurality of cutting edges 9 disposedat different distances from the axis of rotation of the tool and sodisposed as to come successively into engagement with the work when thetool is rotated about its eccentric axis. The other spindle 7 has a cam10 secured thereto and adapted to rotate therewith, this cam being ofsomewhat the same outline as the cutting tool 8 but being free of anycutting edges. The cam is merely provided to counter balance the tool 8during the rotation of the cutting head andthus reduce vibration to theminimum. Both of the spindles 6 and 7 are provided with collars 11 whichbear against the back face of the head 1 and thus serve to hold the tool8 and the cam 10 close to the front face of the head. The spindles 6 and7 project rearwardly from the collars 11 and these projecting portionsare provided with spiral grooves 12 and project into diametricallyopposed openings 13 formed within a flange 14. This flange extendsannularly from a sleeve 15 mounted to slide upon the extension 2. Lugs16 extend from the walls of the openings 13 and into the spiral grooves12 so that, when sleeve 15 is shifted toward or from the head 1, thespindles 6 and 7 will be caused to rotate, thus producing acorresponding movement of the tool 8 and cam 10.

An annular groove 17 is formed in the sleeve 15 and is engaged by lugs18 extending inwardly from the terminals of a fork 19. This fork isformed at one end of a lever 20 and it will thus be seen that when thelever is swung upon its fulcrum, the lugs 18 will shift the sleeve 15longitudinally along the extension 2 so as thus to cause the spindles 6and 7 to rotate simultaneously.

It is to be understood that the head 1 and all of the parts connectedthereto rotate with the spindle S and the stock to be shaped, and whichhas been indicated by dotted lines at W is fed end first against thefront face of the head 1. While the stock is thus held centered againstthe head, lever 20 is shifted so as to move sleeve 15 gradually towardthe head 1. During this movement the lugs 16 will travel within thespiral grooves 12 and cause the spindles 6 and 7 to rotate slowlythereby bringing one of the cutting edges 9 into engagement with thestock. As soon as this cutting edge has cleared the stock from the paththereof, the spindles are again rotated by shifting sleeve 15, thusbringing the next cutting edge into engagement with the stock. Thus itwill be seen that, by moving the cutting edges successively intoengagement with the stock, the stock can be quickly shaped. In theconstruction shown the cutting edges are so arranged as to produce afrusto-conical dovetail or tongue upon the end of the stock. It is to beunderstood, however, that the cutting edges can be of any other desiredcontours so as to produce other shapes than the one described.

Importance attached to the fact that, by providing a structure such asherein described, the cutting edges of the series provided 011 thecutting tool can be fed gradually and successively against the stock soas to reduce the stock transversely, this adjustment being effectedwithout interfering with the continuous rotation of the cutter head onwhich the tool is mounted.

Instead of mounting the counter balance 10 for rotation, as hereinbeforedescribed,

said cam or counter balance can be mounted on a spindle 21 which is notgrooved and which will not, therefore, rotate during thev of the head, acutting tool e ccentrically mounted on the spindle and having aplurality of cutting edges arranged successively around the peripheryand disposed at different distances from the spindle, said spindle beingprovided with a spiral, and means shiftable along lines parallel withthe axis of rotation of the cutter head and engaging the spiral forrotating the spindle and the tool during the movement of said means, tobring the cutting edges successively into engagement with the side ofthe work.

2. The combination with a revoluble cutter head having an extension, ofa spindle mount-ed for rotation in the head and parallel with the axisof rotation of the cutter head, a cutting tool eccentrically mounted onone end of the spindle and having a plurality of cutting edges arrangedsuccessively around the periphery and disposed at different distancesfrom the spindle, said spindle being provided with a spiral groove, andmeans slidably mounted on the extension and engaging the grooved portionof the spindle for rotating the spindle and the tool during the movementof said means to bring the cutting edges of the tool successively intoengagement with the side of the Work.

In testimony that I claim the foregoing as my own, I have hereto atlixedmy signature in the presence oftwo witnesses.

WEBSTER G. STROZIER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. 7

Washington, D. G.

